Chemistry - Study Mode

[#266] Which is known as carbolic acid?
Correct Answer

(A) Phenol

Explanation

Solution: Phenol is known as carbolic acid.

[#267] Citric acid is present in free form in
Correct Answer

(D) Lemon

Explanation

Solution: Lemons, oranges, limes, and other citrus fruits naturally possess high concentrations of citric acid. The juice of the lemon is about 5% to 6% citric acid, which gives lemons a sour taste. In fact, Citric acid was first isolated in 1784 by the chemist Carl Wilhelm Scheele, who crystallized it from lemon juice.

[#268] Which one of the following metals pollutes the air of a city having large number of automobiles?
Correct Answer

(C) Lead

Explanation

Solution: Tetra ethyl lead (C 2 H 5 ) 4 Pb is used as an antiknock compound . It is mixed with petrol to improve its quality. Therefore automobile exhausts lead, which pollutes city.

[#269] Pollutant from motor car exhaust that causes mental disease is
Correct Answer

(A) Lead

Explanation

Solution: Lead is the most hazardous metal pollutants of automobile exhausts. Its effects are lead poisoning, anaemia, kidney disease, convulsions and also causes brain damage in children. It also affects central nervous system and distorts the red blood corpuscles.

[#270] The most common cause of pollution of air is
Correct Answer

(C) Sulphur dioxide

Explanation

Solution: The most common cause of pollution of air is Sulphur dioxide.